ID Please we just call her Milly!

This is a discussion on ID Please we just call her Milly! within the Coral and Reef Creatures forums, part of the Advanced Saltwater Discussion category; -->
So i thought i would place a picture of our little friend on here. She seems to pop out of a hole in one ...

So i thought i would place a picture of our little friend on here. She seems to pop out of a hole in one of our Fijian living rocks. We have only had the tank set up a week and this is the first sign of life so we are very excited.

Please can someone help ID her? We need to know if she could pose a threat, especially if she multiples.

bristle worm.. there is some debate as to if they are good or not for a tank but IMO they are good for siring the sand and eating waste.... if you get a lot of them its an indication that you may be over feeding... if you chose to remove it use tweezers as the little britsles will sting you and it burns quite a bit....